Ospreys in California: The fish-catching hawk by season and region

Ospreys live in California mainly as nesting birds from spring through early fall. They arrive at lakes, reservoirs, rivers and bays from mid-March to early April, raise their young and leave in October for Central and South America, according to the California Department of Fish and Wildlife's (CDFW) California Wildlife Habitat Relationships account. That account describes the osprey as a breeding bird of northern California and an uncommon winter visitor on the southern California coast. A 2022 study in CDFW's scientific journal reports that the species has since spread to San Francisco Bay, the central and southern coast, the Coast Range, the Sierra Nevada and the Sacramento area.

The osprey is protected in California as a bird of prey and as a migratory bird under state and federal law. It is not listed as endangered or threatened, and it is not a fully protected species.

This guide covers how to identify an osprey, where and when it occurs in northern and southern California, how it fishes and nests, what it sounds like, how the law protects it and which birds look like it. It is part of our guide to the birds of California and our guide to birds of prey in California.

Osprey identification: White underparts, a dark eye stripe and wings bent into an M:

The osprey is a large, slender hawk with long, narrow wings and long legs. It is brown above and white below, with a white head crossed by a broad brown stripe through the eye, according to All About Birds, the Cornell Lab of Ornithology's species guide. In flight, the wings bend at the wrist into a shallow M when seen from below, and they are mostly white underneath with a dark patch at each wrist. Adults measure about 21 to 23 inches long, with a wingspan of about 5 to 6 feet and a weight of about 3 to 4½ pounds. That makes the osprey smaller than a bald eagle but larger and longer-winged than a red-tailed hawk.

Young ospreys have white spots on the back, a buffy wash across the breast and orange eyes. The best field mark is behavior. An osprey flies over water on steady wingbeats, often hovers for a moment and then plunges feet first to grab a fish. It is often seen carrying a fish in its talons, which it turns head-first to cut wind resistance.

Osprey at a glance: Size, season and status in California

Sources: CBRC checklist (September 8, 2026); CDFW CWHR account B110; Airola and Estep, California Fish and Wildlife Journal (2022); All About Birds.

Ospreys in California: Spring and summer nesters from the Cascades to the coast:

CDFW's habitat account describes the osprey's classic California breeding range as the north: from the Cascade Range south to Lake Tahoe and along the coast south to Marin County. It names Shasta Lake, Eagle Lake, Lake Almanor, other inland lakes and reservoirs and the river systems of the northwest as regular nesting sites. Ospreys there live mainly in ponderosa pine and mixed conifer country, always close to large, fish-bearing water.

That picture has grown. In the late 1970s and 1980s, nesting was largely limited to the coast north of San Francisco Bay and to interior rivers and lakes in the Cascades region, Daniel Airola and James Estep wrote in their 2022 study in the California Fish and Wildlife Journal. Surveys since then have found ospreys nesting in San Francisco Bay, along the central and southern coast, in the Coast Range and in the Sierra Nevada. In 2021 the authors located 41 nests along the Sacramento River, at the Port of Sacramento and at reservoirs and ponds in the Sierra foothills. They describe the result as a range expansion into central interior California.

Ospreys arrive on their nesting grounds from mid-March to early April. In October they head south along the coast and the western slope of the Sierra Nevada toward Central and South America, according to the CWHR account.

Ospreys in southern California: Coastal winter visitors and returning nesters

Southern California once had nesting ospreys and lost them. The southern mainland population was eliminated by the 1910s, mainly through persecution by fishermen, and the Channel Islands population was nearly gone by the 1930s, the 2022 study says. The older CWHR account lists the osprey as an uncommon breeder along the southern Colorado River and an uncommon winter visitor along the southern California coast. The 2022 study counts the southern coast among the areas the species has since spread back into.

Osprey habitat, diet and nesting in California: Stick nests on snags and poles near clear water:

Ospreys need open, clear water to fish. The CWHR account lists rivers, lakes, reservoirs, bays, estuaries and surf zones, and it notes that ospreys may travel 5 to 6 miles from the nest to fish. The diet is almost entirely fish. CDFW's account adds that ospreys take a few mammals, birds, reptiles, amphibians and invertebrates. An osprey's outer toe can turn backward, so the bird can grip with two toes forward and two back, and barbed pads on its feet help it hold slippery prey, All About Birds says. Bald eagles and gulls often steal ospreys' fish.

The nest is a platform of sticks on top of a large snag, a dead-topped tree, a cliff or a human-made structure. The CWHR account says nests are usually within about 1,300 feet of fish-bearing water but can be up to a mile away, and pairs need tall, open-branched trees nearby to land on and for the young to practice flying. Ospreys breed from March to September, laying one to four eggs, usually three. They often nest in loose colonies and first breed at 3 years of age.

Human-made structures now carry most nests in some areas. In the 2022 central interior California study, 34 of 39 occupied nests were on human-made structures, and nearly half sat on platforms, mostly on utility poles and poles put up for ospreys. Of the nests the authors monitored closely, 71% fledged at least one young, which they said suggests a healthy population. Pesticides caused nesting failures in the past, the CWHR account says, and the 2022 study ties the osprey's recovery to the 1972 ban on DDT, along with new reservoirs and human-made nest sites.

Osprey calls and sounds: High-pitched whistles that build to a squeal near the nest:

Ospreys have high, whistling voices. All About Birds describes slow chirps given in flight or as an alarm, and a run of calls that rises in intensity and falls away, which it compares to "a whistling kettle taken rapidly off a stove." That second call is given most often when an unfamiliar osprey comes near the nest, and it can build to a wavering squeal as the threat grows. The All About Birds osprey sounds page includes recordings made in California.

Osprey legal status in California: A protected bird of prey that is not listed:

The osprey is not listed as endangered or threatened under state or federal law, and it is not among the fully protected birds in Fish and Game Code section 3511. CDFW's Raptors of California page lists it among California's other raptors and does not include it in its raptor Species of Special Concern.

It is still protected. CDFW says all of California's raptors are covered by Fish and Game Code sections 3503, 3503.5, 3505 and 3513. Section 3503 makes it unlawful to take, possess or needlessly destroy the nest or eggs of any bird, and section 3503.5 makes it unlawful to take, possess or destroy any bird of prey or its nest or eggs, except as the code allows. Section 3513 protects every bird on the federal Migratory Bird Treaty Act list, which includes the osprey.

Similar species to the osprey in California: Bald eagles, red-tailed hawks and turkey vultures:

The adult bald eagle also hunts fish over open water, but it is larger and has a dark brown body with a white head and tail, where the osprey is white below. Bald eagles soar on flat, board-like wings, All About Birds says, rather than the osprey's bent M. The red-tailed hawk is smaller and shorter-winged than an osprey, All About Birds notes.

The turkey vulture can look similar at a distance. It is dark below, with pale flight feathers that give its underwing a two-toned look, and it rocks from side to side as it soars with its wings raised in a V, according to All About Birds.

Ospreys in California: A fish hawk whose nesting range has spread south:

Ospreys in California were lost from the southern mainland a century ago and suffered nesting failures in the DDT era. Today they nest from the northern lakes to the Sacramento area and along the central and southern coast, often on poles and platforms people have built. The osprey is not listed, but state and federal law protect the bird, its nest and its eggs. The best time to see one in California is from spring through early fall at a large lake, reservoir, river or bay, before the October migration south.